If the left side of the front of the neck is painful, the following causes are common: First, neck trauma: such as muscle strain, cervical fracture, can cause pain on the left side of the neck, and can be accompanied by cervical spine activity restrictions, local pressure when the pain is more obvious, taking X-rays may see the fracture, through early braking, cold compresses, can reduce the pain symptoms. Second, thyroid disease: such as nodules in the left lobe of the thyroid gland or the formation of malignant tumors, can lead to pain in the front left side of the neck, and in serious cases, it can affect swallowing and even normal pronunciation, through ultrasound examination, can confirm the existence of lesions in the thyroid gland. Surgery is required at an early stage, and postoperative pathological histological examination can confirm the presence of nodules or malignant tumors. Through early diagnosis and treatment, clinical symptoms can be relieved.